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Property, plant and equipment - Right-of-use assets (Leases) (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
Ports [Member]  
IfrsStatementLineItems [Line Items]  
Beginning balance $ 657
Depreciation (27)
Translation adjustment 6
Ending balance 636
Ships [member]  
IfrsStatementLineItems [Line Items]  
Beginning balance 453
Depreciation (21)
Ending balance 437
Additions and contract modifications 5
Pelletizing Plants [Member]  
IfrsStatementLineItems [Line Items]  
Beginning balance 204
Depreciation (25)
Translation adjustment 17
Ending balance 208
Additions and contract modifications 12
Properties [Member]  
IfrsStatementLineItems [Line Items]  
Beginning balance 87
Depreciation (13)
Translation adjustment 7
Ending balance 81
Energy Plants [Member]  
IfrsStatementLineItems [Line Items]  
Beginning balance 39
Depreciation (3)
Translation adjustment 1
Ending balance 37
Mning Equipment And Locomotives [Member]  
IfrsStatementLineItems [Line Items]  
Beginning balance 15
Depreciation (2)
Ending balance 15
Additions and contract modifications 2
Property Plant And Equipments [Member]  
IfrsStatementLineItems [Line Items]  
Beginning balance 1,455
Depreciation (91)
Translation adjustment 31
Ending balance 1,414
Additions and contract modifications $ 19